Periodic Itiventory Using Fifo, UF:, and Weighted Avernge Cost Methods The units of an item avalable for sale during the year were as followsi There sre 20 units of the item in the physical inverntory at December 31. The periodic inventory system is used. Determine the inyentory cost ining (a) the firstin, first put (P) metwod; (b) tive lost in, first-out (Lafo) method; and (c) the weighted nverage cost method (Round per unit cost to two decimal places and your final answer to the ne whote doliar)